Graduation project based on 51 microcontroller 8-key electronic keyboard design (schematic diagram, source program, etc.)

AT89C52 microcontroller is used as the core control component to design an electronic keyboard. The microcontroller is used as the main control core, and it forms the core main control module together with the keyboard speaker and other modules. The main control module is equipped with 8 buttons and a reset button.

Use the microcontroller to generate different frequencies to obtain the scale we require, and finally we can play the notes we want to express at will. And it is elaborated in detail from the schematic diagram, main chips, module principles and debugging of programs of various sizes. A piece of music is composed of many different scales, and each scale corresponds to a different frequency, so that we can use a combination of different frequencies to form the piece we want to play. Of course, it is very convenient for the microcontroller to generate different frequencies. We can use the timer/counter T0 of the microcontroller to generate such a square wave frequency signal. Therefore, we only need to correctly write the corresponding frequency relationship of the musical scale of a song to achieve what we want. repertoire. On this basis, the electronic keyboard has the proper key pronunciation effect it deserves.